[Issue 7509] Allow SIMD variable contents to have all their values changed to a single float variable

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7509


Martin Nowak <code at dawg.eu> changed:

           What    |Removed                     |Added
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                 CC|                            |code at dawg.eu


--- Comment #5 from Martin Nowak <code at dawg.eu> 2013-04-08 12:51:33 PDT ---
Actually GDC and LDC are capable of generating optimal code for scalar to
vector assignment.

auto foo(float a)
{
    __vector(float[4]) va = void;
    va = 2 * a;
    return va;
}

> I think this should be prohibited at all costs.

It's not helpful that dmd currently disallows this assignment
because it promotes usage of 'vec.array = val' which uses the stack.
Of course one could write a library wrapper but isn't it much
better to leave this to the compiler?

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